The Difference Between Aisin and Allison Transmissions

Several manufacturers from all over the world offer a wide variety of remit transmissions. But for reliable and smooth performance in both commercial and passenger vehicles, Aisin and Allison continue to be the two most popular and preferred options. 

Aisin is a Japanese company that manufactures transmissions for several known car brands, such as Ford, RAM, Mitsubishi, Toyota, Nissan, and Lexus, due to their durable and reliable transmissions. They are designed to handle high torque loads and are built to last longer than others. However, they may not be as smooth-shifting as other transmissions.

Meanwhile, Allison is an American company specializing in heavy-duty transmissions for commercial vehicles, such as GMC, Chevy, and many others. This is due to the durability of lead-free alloy found in Allison transmissions, which contributes to their longer product life than that of Aisin. In addition, Allison is driven by Continuous Power Technology, which doubles engine torque upon launch and provides uninterrupted power to the wheels, enabling trucks to operate efficiently within their duty-cycle speeds.


Comparison of Aisin and Allison Transmissions

Aisin and Allison’s transmissions have significant differences that make them suitable for different driving needs. Aisin is known to be heavier and more economical, providing better pulling power than Allison. It also requires a longer warm-up time, making it suited for slower-paced applications such as towing. Meanwhile, Allison delivers smoother shift points making it best to use in high-performance vehicles or heavy work for optimal results.

Each transmission offers sizes and gearing options. However, they differ in terms of the size of their torque converters. Depending on the application, this can impact fuel economy; smaller converters are more efficient but less durable than larger ones. On the other hand, a larger torque converter makes for smoother gear shifts and better overall durability.

Furthermore, the Aisin excels over the Allison regarding towing capacity. This is because Aisin transmissions are designed to take heavier loads. But when it comes to shifting performance, Allison has more consistent shift points that result in an improved overall driving experience.

Ultimately, both transmissions have their own strengths and weaknesses. Make sure you clearly understand the different kinds of applications you will be employing the car for and the kinds of driving you’ll be undertaking before making a final decision.

Aisin Transmission Models

Aisin transmissions provide reliable performance for many different vehicles. Their lineup of transmission models is comprehensive, ranging from light-duty to heavy-duty designs. Commonly partnered with engines such as the 6.7L Cummins turbo-diesel and the 6.4L V8 engine, Aisin transmissions have proved themselves time and again to be up to the challenge of providing smooth and durable power transfers. As a result, they continue to be a well-liked option among drivers in various sectors, including the automobile industry, commercial fleet operators, and various other fields.

Here are a few of Aisin’s most popular transmission models:


Aisin-Seiki’s AS68RC transmission model is a six-speed, torque rated from 0-9, rear-wheel drive combination that Chrysler initially adopted for production work trucks for the 2007 model year. With an impressive list of features designed to enhance performance and improve fuel efficiency in commercial vehicles, the Aisin transmission model series continues to be a popular choice among vehicle manufacturers. It is renowned for its reliability, durability, and strength from medium- to heavy-duty trucks. But still, a few light-duty trucks are also equipped with this heavy-duty transmission.


The newer and improved AS69RC succeeded the AS68RC transmission. Aisin Seiki offers six forward gears in this model. This elite transmission was designed with Dodge and featured a torque capacity. Pre-loaded performance ranges are ideal for hauling large cargo and pulling heavy equipment, making the AS69RC a top choice for vehicle owners who travel long distances frequently. 

The great and reliable model of AS69RC include Ram 3500HD, 4500, and 5500 chassis cabs that provide full driver control and convenience. It features superior reverse load capabilities, increased tolerance for band adherence, and improved fuel economy without sacrificing performance.


The AS66RC transmission is an upgrade of the AS69RC and offers impressive capabilities in different commercial applications. It allows higher control and responsiveness on the Rams 3500 and 4500, as well as in 5500 cab chassis models starting with the 2014 model year. This is made possible by a sharper downshift cycle in the Tow/Haul Mode, making this transmission applicable in the heavy industry since it can perform in harsh environments. 

Additionally, its innovative design includes a Transmission Control Module that temporarily switches off the exhaust brake while shifting. This mode provides enhanced performance of commercial applications, making it an excellent choice for your fleet of vehicles if you are searching for high-performance transmissions.

Considerations for Selecting the Best Transmissions

There are a few important factors to consider before deciding on the transmission that will work best for your driving needs. Here are a few:

  1. Weight- If you have heavier engine components, it will require a stronger transmission to ensure stability, safety, and dependability in performance.  Thus, choose the transmission that is compatible with your car’s weight to reduce excessive wear and tear on both components.
  2. Size- If a transmission is too small, it may not be suitable for your intended purpose. Similarly, you may waste money and resources if it’s too large. So, consider the size of the space available before settling on a specific model.
  3. Performance- To ensure a smooth drive, you need to select an engine that runs efficiently and delivers reliable acceleration. Additionally, evaluating fuel consumption and desired speed range helps further narrow down the selection process. You can also consider emissions ratings and noise levels when selecting the right transmission for your vehicle.


Overall, Aisin transmissions offer a great combination of pulling power and durability, making them ideal for commercial and industrial towing applications. So if you need a transmission that can handle weight and stress, Aisin is a better choice. However, if you need something smaller, lighter, and with smoother shift points, then the Allison would be a great pick. Additionally, consider the weight requirements, size specifications, and performance preferences when selecting a transmission. Doing so ensures optimal performance throughout the fleet of your vehicles.

About the author, Laurence Perkins

Laurence Perkins is the passionate car enthusiast behind the blog My Auto Machine. With over a decade of experience in the automotive industry, Perkins has knowledge and experience with a wide range of car makes and models. His particular interests lie in performance and modification, and his blog covers these topics in-depth. In addition to his own blog, Perkins is a respected voice in the automotive community and writes for various automotive publications. His insights and opinions on cars are highly sought-after.